SU711596A2 - Graphic information readout arrangement - Google Patents

Description

t

J The invention relates to the field of automation and computer technology, in particular, to devices for reading graphic information, and can be used in graphic information devices from an on-screen television receiver in a computer.

The first of the known devices contains a CRT, a reject system, two analog-to-digital converters, coordinate registers x and y, a state control unit, state registers X and Y, two totalizers, two nonlinear encode WJ1X devices, increment registers X and Y, a timer and a pointer control unit 1.

The disadvantage of this device is the low speed of coding the coordinates.

Another device for reading graphic information is also known, which contains a scanning unit connected to time selection blocks, a video control and the first marker coordinate generation unit, a second marker coordinate formation unit, the input of which is connected to the first through the control unit

the marker coordinate generation unit, and the output is connected to the marker selection, time selection and marker movement units, a coordinate-time coincidence block connected to the marker selection blocks, video control, time selection, and the OR element connected to the time selection block, whose output connected to the marker interleaver unit, and with the marker 2 displacement and selection units.

The last of these devices is the closest to the technical solution described by the technical essence.

Its disadvantage lies in the low speed of the device when encoding graphic information.

The purpose of the invention is to eliminate this drawback, i.e., to improve the speed of devices. The goal is achieved by the fact that the proposed device includes a marker code correction block connected to a block of coordinate-time matching, a code correction sign determining block, inputs

which are connected to the time selection blocks, highlighting the marker I, correcting the marker code, and the output:; connected to the second Formation block of the marker coordinates, and the driver connected to the scanner and the first and second blocks | coordinate coordinates.

The invention is illustrated in the drawing, which shows a diagram of the device.

The device includes a scanning unit 1. A video control unit 2, a first 3 and a second 4 marker coordinate blocking, a control unit 5 a shaper of a pedestrian-marker signal, a time selection unit 7, a marker selection unit 8, a coordinate-time matching unit 9 marker movement unit 10 , element .11 OR, block 12 of the correction of the marker code and block 13 for determining the sign of the correction.

The device works as follows.

Scanning unit 1 generates a video signal by reading the storage medium disposed in front of it. The video signal is fed to the first marker coordinate formation unit 3, consisting of a register U, a frame-controlled time lag unit (CPRP) and a former. The shaper forms a pulse in time, which coincides with the falling edge of the clock sync pulse. This impulse is transmitted through the CRPD, the delay time of which is determined by the counter code Y. The signal from the output of the first Marker coordinate formation unit 3 enters the shaper of the pedestal-marker signal, the video signal from the scanning unit 1 simultaneously arrives. With the arrival of the sync pulse line, the number of which corresponds to the register code of the first generator 3 coordinates of the marker, the generator b forms a marker pulse, the time position of which coincides with the trailing edge of the horizontal sync pulse and square wave (pulse-pedestal for the marker), coinciding in time with its center with the pulse. marker. These two pulses are summed to form a pedestal-marker signal, and from the output of the imaging unit 6, the pedestal-level marker signal goes to the second marker coordinate formation unit 4. The last parity of the register.X and the line block of the adjustable lag (PSBR), the delay time of which is determined by the register code X. From the output of block 4, the pedestrian-marker signal goes to the inputs of block 7.8 and 10. At the same time, to the second input of block 7, selection pic

the video signal from scanner unit 1 stumbles. Through block 7, only that part of the video signal, which coincides in time with the delayed pedestal impulse, is transmitted. From the pedestal-marker signal of the signal by block 8, the marker signal is extracted. Suppose that in the selected time interval there is a discrete pulse of graphic information. Temporary

the position of this pulse relative to the time position of the pulse of the marker can be characterized by three states: the discrete pulse in time advances the pulse of the marker,

e both pulses coincide in time, the marker impulse transmits the discrete pulse. In the first case, a discrete pulse from the output of block 7 is fed to the inputs of blocks 10, 11, 13 and 3. Pulse

the marker from block 8 is fed to the blocks

9.11 and 13. The pulses of the marker and the discrete pass through the element 11 OR and the block 9J are fed to the inputs of the block 12 of the correction of the marker code. Here, a sequence of two pulses is transformed into a square wave, with which the shock excitation circuit is triggered. The sinusoidal signal from the output of the shock excitation circuit is limited and differentiated. Differentiated impulses from high speed of block 12. through the block 13 determining the sign of the correction is transferred to the register X of the block 4. Since the discrete pulse is ahead of the marker pulse, the code 5 of the register X needs to be corrected

in the direction of decreasing. This is accomplished by block 13, which addresses the pulses from block 12 to the subtracting input of register X.

0 The coincidence of a discrete pulse with a marker pulse is fixed by block 9, which in this case does not transmit pulses from the output of element 11 OR to correction block 12 from the marker code.

If the marker impulse is ahead of the discrete impulse, then, by analogy. with the first case, the pulses, having passed the element 11 OR and the block 9, start the block 12 of the marker code correction. The pulses from the output of the latter are directed by block 13 to the summing input of the register X of the second block 4 of the formation of the coordinates of the marker, bringing the code value to a value; which would correspond to the temporal coincidence of the pulses of the marker and the discrete information.

In the operation of the device, a fourth situation is also possible, when the time interval does not contain a pulse of discrete information. In this case, in block 10, the movement of the marker is formed. An impulse corresponding to the rear front of the pedestal impulse is formed. $ 5this and marker pulses come in

in block 12, after which B register X receives a pulse sequence, correcting the code of the last. With the arrival of the same line in the next frame, the described process is repeated until the video signal time interval ;. the time coincides with the pedestal-marker signal at the output of block 4, it doesn’t work — the discrete information pulse about the device. Then the device operates according to one of the dreams described above,

When a discrete pulse of information appears, the output of block 7 of time selection B is a register. The first block of the formation of the marker coordinates 3 receives a pulse that increases (decreases) the code of the latter, selects the next line and repeats the process. In the device, it is possible for the operator to influence the encoding process by means of the control unit 5.

The introduction of additional blocks and new constructive links allows to significantly increase the speed of the device.

Fore: "g la invention

A device for comparing graphic information, characterized in that, in order to improve the speed of the device, it contains a marker code correction block connected to a coordinate-time coincidence block, a block

0 determine the sign of the code correction, the inputs of which are connected to the time selection blocks, marker selection and marker code correction, and the output is connected to the second marker coordinate generation unit and

5 a forg erover connected to a scan unit and to the first and second marker formation units.

Information sources,

0 taken into account in the examination

1. US patent number 3541521, CL 340172, 5, publ, 1970.

2. A positive decision on the vyschasche copyright certificate of the USSR

five

according to application number 2154509 / 18-24, (prototype).

Claims (1)

The claims in block 12, after which the pulse sequence arrives in the register X, adjusting the code of the latter. With the arrival of the same line in the next frame, the described process is repeated, and so on, until in the time interval of the video signal; in time coinciding with the pedestal-marker signal at the output of block 4, a pulse of discrete information appears the three modes described above. When a pulse of discrete information appears at the output of block 7 of temporary selection in the register, the first block 3 of the formation of marker coordinates receives a pulse that increases (decreases) the code of the latter. The next line is highlighted and the process repeats. The device has the ability for the operator to influence the encoding process using the control unit 5. The introduction of additional blocks and new structural connections can significantly improve the speed of the device. A device for reading graphic information, including the fact that, in order to improve the performance of the device, it contains a marker code correction unit connected to a coordinate-time coincidence unit, a correction sign determination unit 'коррекцииθ' code, the inputs of which are connected to blocks of temporary selection, marker allocation and marker code correction, and the output is connected to a second marker coordinate generation unit and a former connected to the scanning unit and to the first and second mark coordinate generation blocks a. .